Year	U.S. dollars (Billions)
1980	-0.095
1981	-0.044
1982	-0.087
1983	-0.043
1984	0.026
1985	-0.027
1986	-0.056
1987	-0.061
1988	-0.087
1989	-0.051
1990	-0.084
1991	-0.141
1992	-0.139
1993	-0.082
1994	-0.056
1995	-0.122
1996	-0.154
1997	-0.117
1998	-0.140
1999	-0.127
2000	-0.140
2001	-0.169
2002	-0.140
2003	-0.162
2004	-0.207
2005	-0.204
2006	-0.176
2007	-0.216
2008	-0.223
2009	-0.177
2010	-0.172
2011	-0.266
2012	-0.255
2013	-0.525
2014	-0.419
2015	-0.430
2016	-0.437
2017	-0.097
2018	-0.185
2019	-0.055
2020	-0.021
2021	-0.187
2022	-0.340
2023	-0.305
2024	-0.380
2025	-0.383
2026	-0.384
2027	-0.371
2028	-0.399
2029	-0.326